Acetamide,2-[3-[1-(3-chlorophenyl)tetrahydro-3-methyl-2,4,6-trioxo-5(2H)-pyrimidinylidene]-2,3-dihydro-1H-isoindol-1-ylidene]-2-cyano-N-(2,3-dihydro-1,3-dioxo-1H-isoindol-5-yl)-